http://blog.sina.com.cn/s/blog_6296abc601018p86.html

在文件/etc/apt/sources.list的最后添加下面的源：

deb http://us.archive.ubuntu.com/ubuntu/ hardy multiverse
更新apt源

sudo apt-get update
安装sun-java6-jdk

sudo apt-get install sun-java6-jdk
===================
for ubuntu 13.04

$ sudo add-apt-repository "deb http://ppa.launchpad.net/ferramroberto/java/ubuntu natty main"
$ sudo apt-get update
$ sudo apt-get install sun-java6-jdk
http://blog.csdn.net/cydsxm/article/details/12650025